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15-104304
�ELtera.�l way �`� Jim Ferrell, Mayor September 3, 2015 AHBL, Inc Attn: Brad Medrud 2215 N 30t' St, Suite 300 Tacoma, WA 98403 RE: Permit #15-104304-00-C®; Panther Lake Elementary — Portable Classroom; 34424 1" Ave S Dear Mr. Medrud, The Public Works Department has reviewed the plans submitted for the above -referenced permit. Prior to our approval, please address the following comments: 1) Provide a temporary erosion and sediment control (TESC) plan, with applicable details. Provide notes and other details that summarize how all areas that are disturbed during construction will be stabilized. 2) Show the location of the downspout drain(s) point of discharge, the means of dispersing that discharge, and any applicable details. 3) Show/identify the location of the downspout drainage discharge for the portable classroom placed in 2014, just to the north and east of this proposed portable. 4) Provide information regarding the ramps and stairs for accessing the classrooms (i.e., similar to that which is identified on the Mirror Lake Portable project plans). 5) For final plan/permit approval, the engineer shall sign and date his seal on the plan sheet(s). 6) Provide the City's standard permit approval block in the lower right-hand corner of all civil sheets, and include the permit # (noted above), in the space provided. Please revise the plans and/or provide the additional requested information, and re -submit 4 copies for our review. If you have any questions, please contact me at (253) 835-2734, or at kevin.peterson@cityoffederalway.com. Sincerely, \LJJ .w P Kevin Peterson Engineering Plans Reviewer KP:mt CC,. Project file Day file L: \CS DC\DOCS\SAVE\24403009062. DOC 33325 8th Avenue South, Federal Way, WA 98003-6325 (253) 835-7000 - www.cityoffederalway.com „:WPS 2015 PAN , HER LAKE ELEMENTARY SCHOOL MODULAR A PORTION OF THE NE. 1/4 OF THE NW. 1/4 OF THE SW. 1/4 OF SEC. 20, TWP. 21 N., RGE. 4 E., W.M. KING COUNTY, WASHINGTON vs 0Cp GZ I f FFE=2�65.6 rr��. �' SURVEYOR ^ / a - •� .'I . � - ” FFF G64 : '� _ 2}s N, 30YH ST. SUITE 300 TACOMA,WA88403 t, • "_;[ - -:'�.' ; , .. r r PHONE: ;253) 36}I422 _ _ I FAX: (MSS 34I3.2572 I� L- f I CONTACT: oA= FO J-ANS8E£, PLS - 4 ' c7 I ��• IT EMAIL dfollansbeP+hl"cwn F1 At•eDj LJt N uu I' 9E8A4 A/4CAP V E:iXa637g a985 j . EXISTING PORTABLE •. � 7 I ." '[ � _' �- - - ,_ b�•�. Ll.. _ - i GRAPHIC SCALE 1 � 1 ° • 50 FEET l05.4' I - PROPOSED [ . PORTABLE jx f� e . - F ' • - .. "1 i - 1. f WETLAND AREA INOt4JURISDICTIONAL • : _- - _ WETLAND DOES NOT .- . • . - ..� HAVE A BUFFER) I' ' T WETLAND BOUNDARY 2G SETSACk . AH6L4f0T 4'MINIMUM . .. -, "x AM0 Y1AL77gR v, EAST E=AM'F ASPHALT COMPACTED YN.IX 154.e7 or erG Toy. I t• - - CRUSHED RK= I - ltNLrHOF uc++r POLE _ -y•- CONFORMING TO, - E tyGTO mis ' ' . I _ ELEv'=r1u7 � l'J Know wha4s below. C211 before vau dia. TEMPORARY BENCHMARKS: AHSL#101 NAIL AND WASHER IN EAST EDGE OF ASPHALT WALK WEST OF BIG TOY 1 V NORTH OF rcilnuSa-E7 IirtiEOs y,E 11A1']C5 PARK VICINITY MAP OWNER: FEDERAL WAY PUBLIC SCHOOLS 3333086, AVENUE SOUTH FEDERAL WAY, WASHINGTON 90003 CONTACT: JASON NELSON PH: (253) 945-2000 UTILITIES/SERVICES: WATER: LAKEHAVEN UTILITY DISTRICT SEWER: LAKEHAVEN UTILITY DISTRICT POWER: PUGET SOUND ENERGY (PSE) TELEPHONE: CENTURY LINK BASIS OF BEARING: NAD 83191 WASHINGTON STATE PLANE COORDINATE SYSTEM, NORTHZONE CITY OF FEDERAL WAY HORIZONTAL CONTROL HOLDING CITY MONUMENT NUMBERS 121 AND 122 POINT NO. 121 N=113263.33 E=127081276 CASE MONUMENT AT THE INTERSECTION OF S 336TH STREET W/ 9TH AVENUE S. POINT NO. 122 N=113274 39 E=1268469,47 CASE MONUMENT AT THE INTERSECTION OF S 334TH STREET W/ 1 ST LANE S- PARCEL NUMBER: 2021049110 CIVIL ENGINEER: AHBL, INC 2215 NORTH 300i STREET, SUITE 300 TACOMA, WASHINGTON 93403 CONTACT: WILLIAM FIERST, P E. PH: (253) 383-2422 FAX: (253) 383-2572 SITE DATA: SITE AREA: 11 15 ACRES (4B5,710 S.F ) OCCUPANCYTYPE: E TYPE OF CONSTRUCTION: 5B TOTAL EXISTING AND PARKING: 78 STALLS TOTAL EXISTING GROSS FLOOR AREA OF ALL FLOORS: 46.937 S.F TOTAL PROPOSED GROSS FLOOR AREA OF ALL FLOORS: 1,792 SF, TOTAL EXISTING AND PROPOSED GROSS FLOOR AREA OF ALL FLOORS: 48,729 S F ZONING: OFFICE PARK (OP) SITE ADDRESS: 34424 1ST AVENUE SOUTH FEDERAL WAY, WASHINGTON 98003 VERTICAL DATUM: NGVD 29 CITY OF FEDERAL WAY BENCHMARK NO" 2200-27 CHISELED SQUARE ON NE CORNER OF CONCRETE SLAB OF "WEST HILL COURT SIGN, AT NORTH END OF 10TH PLACE S, 500' NORTH OF S 336TH STREET. ELEV: 32905 WSDO79-03.14{t] LIGHT POLE LEGAL DESCRIPTION SCHOOL SITE: • N:1tG43G.sa24 I E-1266068 6413 PER TITLE REPORT NO, 1251085. BY CHICAGO TITLE DATED NOVEMBER 20. 2007 AND SUPPLEMENTAL ELEV271. T AGREEMENT #1 DATED MARCH 12, 2008, I AHBL1102 THE NORTHEAST I/4 OF THE NORTHWEST 114 OF THE SOUTHWEST I/4 OF SECTION 20 IN TOWNSHIP 21 REBAR AND CAP NORTH OF RANGE 4 EAST W M. IN KING COUNTY WASHINGTON; N:f 10493,4906 - E=1268370.8365 TOGETHER WITH THAT PORTION OF THE SOUTHWEST 114 OF THE NORTHWEST 114 OF SAID SECTION 20, LYING SOUTHEASTERLY OF 1ST WAY SOUTH AS CONVEYED UNDER RECORDING NOS. 7304300579 AND ]ljV'2� 73DW70524 AND LYING SOLtTHWE:STERLY DF THE LUNG COUNTY LIBRARY SITE AS CONVEYED TO KING COUNTY LIBRARY SYSTEM UNDER RECORDING No. IISI a91911. SAID LINE DESCRIBED AS FOLLOWS: I COMMENCING AT THE INTERSECTION OF THE CENTERLINE OF IST PLACE SOUTH RIGHT OF WAY AS CONSTRUCTION SEQUENCE EXT NDED SOUTHEASTERLY, WITH -THE SOUTi IEASTERI•Y MARGIN OF SAID AST WAY SOUTH RIGHT OF THENCE SOUTH 88.20.00• WEST, ALONG SAID MARGIN, 28:55 FEET TO A POINT OF TANGENCY; 1. NTT ACTIVITY, BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY. A ANYCONSTRUCTION CO THENCE CONTINUING ALONG SAID MARGIN, ON A CURVE TO THE LEFT WITH A RADIUS OF 750.00 FEET PEFORE O MUST BE HELD BE THE CITY OF MEETING MUST BE HELD AND A CENTRAL ANGLE OF IC`Oi . A V8TANCE OF 140-41 FEET TO THE TRUE POINT OF BEGINNING OF FEDERAL WAY. THE CONSTRUCTION ANDSAID LINE; REPRESENTATIVE THENCE SOUTH 34°2396" EAST TO THE SOUTH LINE OF SAID SUBDIVISION AND THE TERMINUS OF SAID 2. FLAG CLEARING UMITB: LINE; 4. INSTALL FILTER FABRIC FENCE AS INDICATED ON PLAN. S. INSTALL OFFSITE CATCH BASIN PROTECTION. EXCEPT THE WEST 40 FEET THEREOF AS CONVEYED TO KING COUNTY FOR 1 ST AVENUE SOUTH UNDER 7. CLEAR AND GRUB AREAS OF THE 577E TO BE ROUGH GRADED OR FILLED. RECORDING NUS" 5132057. 5326222, 5329218 AND 5331647 8. INSTALL INTERCEPTOR SWALES/BERMS AND CHECK DAMS. 9 ROUGH GRACE SITE AND INSTALL STORM CONVEYANCE SYSTEM AND RETENTION/DETENTtON FACILRT ES. PROVIDE INLET PROTECTION WHERE INDICATED. S0, INSTALL REMAINING UTILITIES AND eW LOING. 11, FINISH GRADE SITE AND CONSTRUCT ASPHALT PARKING AREAS, — — — ACCEss DRIVES. SIDEWALKS, CURBS AND GUTTERS" 12. COMPLETE SITE STA91L1ZATION IN ACCORDANCE WITH LANDSCAPE PLANS. 14, CLEE7W STORM DRAINAGE SYSTEM, ON AND OFF SITE, OF ALL SEDIMENT AND DEBRIS 14" REMOVE TEMPORARY EROSION CONTROL FACILITIES WHEN SITE IS PERMIT NO. XXXXXXXXXXXXXXXX APPROVED COMPLETELY STABILIZED, DATE SHEETINDEX SHEET NO, SHEET TITLE C1.0 COVERSHEET C2�.N ESC AND DEMOUTION PLAN C3VLSITE PLAOTES AND DETAILS oa .. A r TACOMA • SEATTLE • SPOKANE • TRI-CITIES 2215 North 301h Street, Suite 300 Tama WA 98403 2533B32422 TEL 2533832572 FAX 1 ahhl.mm WEB Prelec, T07a FWPS 2015 PANTHER LAKE ELEMENTARY SCHOOL MODULAR cn Cller_t: FEDERAL WAY PUBLIC SCHOOLS 33330 8TH AVENUE SOUTH FEDERAL WAY, WA 98003 JASON NELSON Jgh No. 2150238.10 Naue Sol S_Date: PERMIT SET AUGUST 7, 2015 %. �Q +� OF a'LT❑A �IsTri /OKAL t^ V a) r m m 0 m °0�a ID M M i CO Revisions: Sheet Title: OJ D (D COVER m w �1 Designed hv: Drawn > ( O m Q Sheet No. r— m C1 m m z I of 4 D DATE: August 6, 2015 FILENAME Q12015\2150238\70_CIV\CAD\2150236-SH-COVR dwg t 4 ,-:WPS 2015 PAN'i HER LANE ELEMENTARY SCHOOL MODULAR A PORTION OF THE NE. 1/4 OF THE NW. 1/4 OF THE SW. 1/4 OF SEC. 20, TWP. 21 N., RGE. 4 E., W.M. KING COUNTY, WASHINGTON ADAPTER SKIRT GEOTEXTILE FABRIC r E�pOILY r IP I . 3 PROTECT EXISTING StDEVOk KTO REMAIN _ `� { � n, I s:f,• ... - f 1 '� '> ' , SAVWCIIT ANDLS9lS•���•� f7 • i CUT WYLLLTO-CONCRETE I, l EXISTINGTNEE- r f 7• �/ -"' .� DEMOEd8H t3iI5TING TREE. / } I EROSION / SEDIMENTATION CONTROL NOTES 1. APPROVAL OF THIS EROSIONISEDIMENTATION CONTROL (ESC) PLAN DOES NOT CONSTITUTE AN APPROVAL OF PERMANENT ROAD OR DRAINAGE DESIGN (I E , SIZE AND LOCATION OF ROADS, PIPES, RESTRICTORS, CHANNELS, RETENTION FACILITIES, UTILITIES, ETC,). 2 THE IMPLEMENTATION OF THESE ESC PLANS AND THE CONSTRUCTION, MAINTENANCE, REPLACEMENT, AND UPGRADING OF THESE ESC FACILITIES IS THE RESPONSIBILITY OF THE APPLICANT/CONTRACTOR UNTIL ALL CONSTRUCTION IS APPROVED, 3. THE BOUNDARIES OF THE CLEARING LIMITS SHOWN ON THIS PLAN SHALL BE CLEARLY FLAGGED IN THE FIELD PRIOR TO CONSTRUCTION. DURING THE CONSTRUCTION PERIOD, NO DISTURBANCE BEYOND THE FLAGGED CLEARIN3 LIMITS SHALL BE PERMITTED. THE FLAGGING SHALL BE MAINTAINED BY THE APPLICANT/CONTRACTOR FOR THE DURATION OF CONSTRUCTION 4. STABILIZED CONSTRUCTION ENTRANCES AND WASH PADS SHALL BE INSTALLEDATTHE BEGIN7ANO.OF CONSTRUCTIONAND MAINTAINED FOR THE DURATION OFTHEPROJECT. ADDITIONAL MEASURES MAYBE REQUIRED TO ENSURE THATALL PAVED AAEASARE KEPT CLEAN AND TRACKING IN THE ROADWAY DOES NOT OCCUR FOR THE DURATION OF THE PROJECT 5. THE ESC FACILITIES SHOWN ON THIS PLAN MUST BE CONSTRUCTED PRIOR TO OR IN CONJUNCTION WITH ALL CLEARING AND GRADING ACTIVITIES, AND IN SUCH A MANNER AS TO ENSURE THAT SEDIMENT LADEN WATER DOES NOT ENTER THE DRAINAGE SYSTEM, ADJACENT PROPERTIES, OR VIOLATE APPLICABLE WATER STANDARDS 6 THE ESC FACILITIES SHOWN ON THIS PLAN ARE THE MINIMUM REQUIREMENTS FOR ANTICIPATED SITE CONDITIONS. DURING THE CONSTRUCTION PERIOD, THESE ESC FACILITIES SHALL BE UPGRADEDANDIOR REVISED AS NEEDED FOR UNEXPECTED STORM EVENTS, AND MODIFIED TO ACCOUNT FOR CHANGING SITE CONDITIONS (E G , ADDITIONAL COVER MEASURES, RELOCATION OF DITCHES AND SILT FENCES, PERIMETER PROTECTION, ETC) 7 THE ESC FACILITIES SHALL BE INSPECTED DAILY BY THE APPLICANTICONTRACTOR AND MAINTAINED AS NECESSARY TO ENSURE THEIR CONTINUED PROPER FUNCTIONING. 8 ANY AREAS OF EXPOSED SOILS, INCLUDING ROADWAY EMBANKMENTS, THAT WILL NOT BE DISTURBED FOR SEVEN (7) DAYS DURING THE DRY SEASON OR TWO (2) DAYS DURING THE WET SEASON, SHALL BE IMMEDIATELY STABIUZEDWITH THE APPROVED ESC METHODS (I.E., SEEDING, MULCHING, NETTING, EROSION BLANKETS, ETC) 9 ANY AREA NEEDING ESC MEASURES, NOT REQUIRING IMMEDIATE ATTENTION, SHALL BE ADDRESSED WITHIN SEVEN (7) DAYS 10 THE ESC FACILITIES ON INACTIVE SITES SHALL BE INSPECTED AND MAINTAINED A MINIMUM OF ONCE A MONTH OR WITHIN 24 HOURS FOLLOWING A STORM EVENT 11 AT NO TIME SHALL MORE THAN 1 FOOT OF SEDIMENT BE ALLOWED TO ACCUMULATE WITHIN A CATCH BASIN ALL CATCH BASINS AND CONVEYANCE LINES SHALL BE CLEANED PRIOR TO PAVING. THE CLEANING OPERATION SHALL NOT FLUSH SEDIMENT -LADEN WATER INTO THE DOWNSTREAM SYSTEM 12 ANY PERMANENT RETENTIONIDETENT ION FACILITY USED AS A TEMPORARY SETTLING BASIN SMALL BE MODIFIED VAT H THE NECESSARY EROSION CONTROI, MEASURES AND SHALL PROVIDE ADEQUATE STORAGE CAIPACTTY. IF THE PER,ANENT FACILITY IS TO FUNCTION ULTIMATELY AS AN INFILTRATION SYSTEM, THE FACILITY SHALL NOT BE USED AS A TEMPORARY SETTLING BASIN- NO UNDERGROUND DETENTIONTANKS OR VAULTS SHALL BE USEOASATEMPOWN' SETTLING BASIN. 13. COVER MEASURES WILL BEAPPLIED IN CONFORMANCE WITH APPENDIX D OF THE KCSWDM. 14 MANAGEMENT PRACTICES PROVIDING SIGNIFICANTTREE PROTECTION (PER FWRC)SHALLBE PROVIDED ON THE ESC PLANS. 15 WET SEASON SPECIAL PROVISIONS, AS DESCRIBED IN SECTION D.52 OF APPENDUC D, %C.SVApA( ARE R4 EFFECT 13CTOBER 1 THROUGH APRIL 30. PRIOR TO 7 NTHE BEGINNING OF THE WET SEASON, ALL DISTURBED AREAS SHALL BE REVIEWED TO IDENTIFY WHICH ONES CAN BE SEEDED IN PREPARATION FOR WINTER RAINS. DISTURBED AREAS SHALL BE SEEDED WITHIN ONE WEEK OF THE BEGINNING OF THE WET SEASOR GENERAL NOTES 1 REMOVE EXISTING SOD AND TOPSOIL AS NECESSARY TO PROVIDE IMPROVEMENTS, CONTRACTOR SHALL DISPOSE OF SOD AND EXCESS MATERIAL OFF -SITE 2 REPAIR PAVING IF DAMAGED DURING PLACEMENT OF PORTABLE GRAPHIC SCALE 3 PROVIDE INLET SEDIMENT PROTECTION PER DETAIL ti 10 xo 40 4 CONTRACTOR/SHALL HYDROSEED ALL DISTURBED NON -PAVED SURFACES PER THE HYDROSEED NOTES ON THIS SHEET. 1" = 20 FEET 5 PROTECT EXISTING PLANTS AND VEGETATION TO REMAIN. 6 DEMOLISH EXISTING IRRIGATION LINES WITHIN PORTABLE LIMITS. ADJUST EXISTING IRRIGATION SYSTEM WITHIN VEGETATION TO REMAIN, CATCH BASIN INLET PROTECTION NOTES AS APPLICABLE: RETRIEVAL STRAP 1. PLACE CONCRETE BLOCKS LENGTHWISE ON THEIR SIDES IN ASINGLE ROWAROUND THE PERIMETER 7 RELOCATE IRRIGATION LINES IF NECESSARY TO MAINTAIN SYSTEM OPERATION OF THE tNLET, 80 THAT THE OPEN ENDS FACE OUTWARD, NOT UPWARD. THE ENDS OF ADJACENT MULCHING NOTES 36• BLOCKS SHALL ABUT. THE HEIGHT OF THBEE BARRIER CAN VARIED. DEPENDING ON DESIGN NEEDS, BY VACKI NG CDMBIMT10NS OF= BLACKS THAT ARE 4 INCHES. AND 12 INCHES WIDE THE ROW OF v BLOCKS SHALL BE AT LEAST 12 INCHES, BUT NO GREATER THAN 24 INCHES, HIGH. 2. PLACE WIRE MESH OVER THE OUTSIDE VERTICAL FACE (OPEN END) OF THE CONCRETE BLOCKS TO PREVENT STONE FROM BEING WASHED THROUGH THE BLOCKS. USE HARDWARE CLOTH OR COMPARABLE WIRE MESH WITH 12INCH OPENINGS. OVERFLOW 3. PILE STONE AGAINST THE THE WIRE MESH TO THE TOP OF THE BLOCKS USE 314 TO 31NCH GRAVEL. (TO BYPASS PEAK STORM 4, PLACE WIRE MESH OVER DROP INLET SO THAT THE WIRE EXTENDS A MINIMUM OF 1 FOOT BEYOND VOLUMES) EACH SIDE OF THE INLET STRUCTURE. USE HARDWARE CLOTH OR COMPARABLE WIRE MESH OF 12 Z4= INCH OPENINGS. IF MORE THAN ONE STRIP OF MESH IS NECESSARY, OVERLAP THE STRIPS 5. PLACE FILTER FABRIC OVER WIRE MESH. PLACE W41NCH GRAVEL OVER WIRE MESH. THE DEPTH OF STONE SHALL BE AT LEAST 12 INCHES OVER THE ENTIRE INLET OPENING. EXTEND THE STONE BEYOND THE INLET OPENING AT LEAST 18 INCHES ON ALL SIDES. 6. IF THE STONE FILTER BECOMES CLOGGED WITH SEDIMENT, THE STONES MUST BE PULLED AWAY FROM THE INLET AND CLEANED OR REPLACED, SEDIMENT ACCUMULATION 7. IF THE CB GRATE BECOMES CLOGGED WITH SEDIMENT, CONTRACTOR SHALL BE RESPONSIBLE TO IMMEDIATELY CLEAN DEBRIS FROM GRATE a INLET SEDIMENT PROTECTION 1 NOT TO 9CALLE Q v 7 Know what's below. Call Wore you dia 1, MULCH MATERIALS USED SHALL BE HAY OR STRAW AND SHALL BE APPLIED AT THE RATE OF 2 TONSIACRE. 2. MULCHES SHALL BE APPLIED IN ALL AREAS WITH EXPOSED SLOPES GREATER THAN 2:1. 3. MULCHING SHALL BE USED IMMEDIATELY AFTER SEEDING OR IN AREAS WHICH CANNOT BE SEEDED BECAUSE OF THE SEASON. 4. ALL AREAS NEEDING MULCH SHALL BE COVERED BY NOVEMBER 1. LEGEND INLET SEDIMENT PROTECTION ® IP e CLEARING LIMITS '_t1 = SILT FENCE - X f X - SF 1 C4.0 HYDROSEEDING NOTES 1. HYDROSEEDING SHALL BEAPPUEDTO ALL DISTURBED NON -PAVED SURFACES 2. HYDROSEEDING TO BE THE FOLLOWING MIXTURE: TYPEOF PROPORTIONS PERCENT PERCENT MIXTURE BY WEIGHT PURITY GERMINATION PERENNIAL RYE GRASS 40 % 90% 90 CREEPING RED FESCUE 40% 90% 90% PREINOCULATED WHITE DUTCH CLOVER 10% 95 % 90 HIGHLAND BENT GRASS 10% 90% 90% 3. APPLICATION TO BE 100 LBSIACRE. 4 500 LBS/ACRE 10-20-20 FERTILIZER, 2000 LBSIACRE MULCH AND 40 LBSIACRE SOIL STABILIZER TO BE APPLIED WITH SEED MIXTURE PERMIT NO. XXXXXXXXXXXXXXXX APPROVED .S TACOMA • SEATTLE • SPOKANE • I -CITIES 2215 North 301h Street, Suite 300 Tamma, WA 98403 2533832422 Ta 2533832572 FAX x .ahbl.cam WEB Prolocl Tiles FWPS 2015 PANTHER LAKE ELEMENTARY SCHOOL MODULAR Client: FEDERAL WAY PUBLIC SCHOOLS 33330 BTH AVENUE SOUTH FEDERAL WAY, WA 98003 JASON NELSON Job No 2150238 10 IVeue PERMIT SET AUGUST 7, 2015 NOTICE Revisions: Sheet Title: TESC AND DEMOLITION PLAN Desloned by: Drawn by: Checked by: Sheet No. C21.0 2 of 4 Sheets DATE August 6, 2015 FILENAME: O:QO15\215023E\10_CIV\CAD\2150238SH-TESC dwg E r'WPS 2015 PAN'i HER LAKE ELEMENTARY SCHOOL MODULAR A PORTION OF THE NE. 1/4 OF THE NW. 1/4 OF THE SW- 1/4 OF SEC. 20, TWP. 21 N., RGE, 4 E.9 W.M. KING COUNTY, WASHINGTON ���. ,'i • i CITY OF FEDERAL WAY GENERAL NOTES I 1- ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH THEIFEDERAL WAY 7- VERTICAL DATUM SHALL BE KCAS OR NGVD-29. REVISED CODE (FWRC), APPLICABLE ORDINANCES. AND THE CITY COUNCIL 1,f CONDITIONS OF PROJECT APPROVAL THESE DOCUMENTS ARE B. GRODHDWATER SYS7BA1 CONSTRUCTION SHALL BE WITHIN A SUPPLEMENTED BY THE STANDARD SPECIFICATIONS FOR ROAD. BRIDGE, R SHT-OF•WAY OR APPROPRIATE OFWMAGE EASEMENTS. BUT NOT AND MUNICIPAL CONSTRUCTION (WSDOTIAPWA), THE KING COUNTY ROAD UNDERNEATH THE ROADWAY SEGTIQN, ALL GROUNDWATER SYSTEMS STANDARDS (KCRS), AND THE KIN^. COUNTY SURFACE WATER DESIGN MUST BE CONSTRUCTED IN ACCORDANCE WITH THE WSDOTIAPWA R MANUAL (KCSWDM). IT SHALL BE THE SOLE RESPONS49PUTY OF THE STANDARD SPECIFICATIONS. APPLICANT AND THE PROFESSIONAL ENGINEER TO CORRECT ANY ERROR, 0 T,] OMISSION, OR VARIA 11ON FROM THE ABOVE REQUIREMENTS FOUND IN 9, ALL UTILITY TRENCHES IN THER[G HT•OF•WAYSHALL BE 9ACIffNCK IDTH THESE PLANS. ALL CORRECTIBNSSHALL BEAT NO ADDITIONAL COST OR CRUSHED ROCK AND COMPACTED TO 95%DE DENSITY. WHEN TRENCH WID LIABILITY TO THE CITY OF FEDF_RAL WAY. IS IS INCHES OR LESS, AND IS VYITHIN THE TRAVELED WAY. TRENCH WILL [r I^ r Be BAC%17I41LED WITH CONTROL DENSITY FILL (SELF -COMPACTED _ 2 THE DESIGN ELEMENTS WITHIN THESE PUNS HAVE BEEN REVIEWED FLOWABLE FILL) AS DEFINED BY WASHINGTON AGGREGATES AND ACCORDING TO THE FEDERAL WAY ENGINEERING REVIEW CHECKLIST. CONCRETE ASSOCIATION. THE AGGREGATE WILL VIE 3ibINCH MINUS. _ • SOME ELEMENTS MAY HAVE BEEN OVERLOOKED OR MISSED BY THE CITY i� CV F" S� ENGINEERING PLAN REVIEWER. ANY VARIANCE FROM ADOPTED 10 ALL ROADWAY SUBGRADE SHALLTH WSDOT AND COMPACTED TO G y.. L ! STANDARDS IS NOT ALLOWED UNLESS SPECIFICALLY APPROVED BY THE 95%DENSITY IN ACCORDANCE WITH WSDOT 2-053. CITY OF FEDERAL WAY, PRIOR TO CONSTRUCTION. - - _ 11.714E CONTRACTORSHALL BE RESPONSIBLE FOR PROVIDING ADEQUATE 3, APPROVAL OF THIS ROAD, GRADING, AND DRAINAGE PLAN DOES NOT SAFEGUARDS, SAFETY DEVICES, PROTECTIVE EQUIPMENT, FLAGGERS, __:, , t 3::-•i ; • CONVEYANCE. SEWER CONVEYANCE , CONSTITUTE AN APPROVAL OF ANY OTHER CONSTRUCTION (I.E. AND ANY OTHER NEEDED ACTIONS TO PROTECT LIFE. WEALTH. AND DOMESTIC WATER CO CE, SE GAS SAFETY OF THE PUBLIC, AND TO PROTECT PROPERTY IN COb1NETOR r - ELECTRICITY, ETC_) WITH THE PERFORIJANCE OF WORK- COVERED BY THE I CONTRACTOR .ANY WORK WITHIN THE TRAVELED RIGHT•oF-WAY THAT MAY INTERRUPT _ _- �„_;,..•}'-= RE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY, A NORMAL TRAFFIC FLOW SHALL REQUIRE AT LEAST ONE FLAGGER FOR 4- BEFO I PRE -CONSTRUCTION MEETING MUST BE HELD BETWEEN THE CITY OF EACH LANE OF TRAFFIC AFFECTED. ALL SECTIONS OF THE WSO87 .-• - - STANDARD SPECIFICATIONS 1-0728 TRAFFIC CONTROL, SHALL APPLY: APPLICANT, AND THE APPLICANT'S CONSTRUCTION I FEDERAL WAY, THE A NT A .... ... _ �', !' 1 1 r i' REPRESENTATIVE - •- -"-- '-- I _.-:1 - 12.COHTRAGTOR SHALL PROVIDE AND INSTALL ALL REGULATORY AND - f•' 1 r� 5 A SIGNED COPY OF THESE APPROVED PLANS MUST BE ON THE JOB SITE WARNING SIGNS THE LATEST EDITION OF MANUAL ON UNIFORM '• - - •- - -'- - - - k- •�� �- d -f N110526.02 �4 �-- 1 • �rAr,• WHENEVER CONSTRUCTION IS IN PROGRESS. TRAFFIC CONTROLL DEVICES (MUTCD). -FG:263B1.23 - r '• u �•�1 13. ALL UTILITIES SHALL BE ADJUSTED TO FINAL GRADE AFTER PAVING �Z _.FG:S64.16 fi, CONSTRUCTION NOISE AND ACTIVITY (ON PRIVATE PROPERTY) SHALL BE ' r I I ; LIMITED AS PER FWRC (SECTION 19.105.040); NORMALLY THIS IS 7:00 AM, ASPHALT WEARING COURSE TO 8:00 P.M., MONDAY THROUGH FRIDAY. AND 9:00 A-M, TO L 00 P.M. ON _.•r'" •^ •y •y !-� R6.0' -� i r SATURDAYS rF6260.30 - •#r ... ' _[ ! ' _ 7 - -;: i.. _ DRAINAGE NOTES -' R4.5' l- TO THE CITY -.. - 4.0' [ . 1. FROM N 1)fJW1.$1 { 1 PROOF OF LIABILITY INSURANCE SHALL BE SUBMITTED 4 ALL DRIVEWAY CULVERTS LOCATED WITHIN THE RIGHT-OF-WAY SHALL ..- _ -_.,.. .... F� 280.58 f , •� �.-� �, _,-, E 128S4G7A1 ± PRIOR TO, OR AT, THE PRE -CONSTRUCTION MEETING. BE OF SUFFICIENT LENGTH TO PROVIDE A MINIMUM 3:1 SLOPE F E, FC'.45950 . _ THE EDGE OF THE DRIVEWAY TO THE BOTTOM OF THE DITCH- FG: 2611,13� 3 _ R5.0' 2 ALL PIPE AND APPURTENANCES SHALL BE LAID ON A PROPERLY 0 '•1 - CULVERTS SHALL HAVE BEVELED END SECTIONS TO MATCH THE SIDE \ _ _ PREPARED FOUNDATION IN ACCORDANCE WITH WSDOT SLOPES FG: 261.18 SPECIFICATIONS. THIS SHALL INCLUDE LEVELING AND COMPACTING I THE TRENCH BOTTOM, THE TOP OF FOUNDATION MATERIAL, AND 5. ROCK FOR EROSION PROTECTION OF DITCHES, CHANNELS AND 25E.33 O FG: FG: 2EZ45 I N •� E p REQUIRED PIPE BEDDING, TO A UNIFORM GRADE SO THAT THE ENTIRE SWALES, WHERE REQUIRED, MUST BE OF SOUND QUARRY ROCK, •••• - FG: 28246 I _ SDCO 4 -- - Y PIPE IS SUPPORTED BY A UNIFORMLY DENSE UNYIELDING BASE, PLACED TO A DEPTH OF ONE FOOT AND MUST MEET THE FOLLOWING 1 N110503.51 I FG- -54 RIM: 259.31 /' SPECIFICATIONS: 4"-8"ROCKNO%-70%PASSING; 2"-4"ROCK/30%40% G�16%FG: ZB2.44 8" IE: 255.fi4 -"' -- -- F{iBiie 2^ E 1268343.04 F43 FG: 282.68 C f, 3. ALL DRAINAGE STRUCTURES, SUCH AS CATCH BASINS AND MANHOLES, PASSING; AND -2"ROCKI70%-2D%PASSING. INSTALLATION SHALL BE IN FG: 260.15 I 20I I.F. y'PQC NOT LOCATED WITHIN A TRAVELED ROADWAY OR SIDEWALK SHALL ACCORDANCE NTH KCRS, OR AS AMENDED BY THE APPROVED PLANS 3 _ I PORTABLE ,.. - 4,79% HAVE SOLID LOCKING LIDS ALL DRAINAGE STRUCTURES ASSOCIATED RECYCLED ASPHALT OR CONCRETE RUBBLE SHALL NOT BE USED. _ FFE. 262.50 WITH A PERMANENT RETENTIONIDETENNON FACILITY SHALL HAVE SDCO 1 �- 259 SOLID LOCKING LIDS ....--R1M'.z60.6o..... ._.. 8"IE: 257.93 - �� • � SDC03 GENERAL NOTES _ _ RIM: 257.1. CONTRACTOR SHALL VERIFY EXISTING AND PROPOSED GRADES BEFORE COMMENCING WORK- IN N 110475,52 1 Y r 3 8" IE: 25489 CONTACT ENGINEER IF ACTUAL GRADES DO NOT REFLECT GRADESOF, TOPOGRAPHICAL SURVEY. E 1268342.29 2. ADJUST EXISTING UTILITIES WITHIN WORK LIMITS TO FINISH D GRADE FG: 25B 50 - - N 110473 82 2 - RD RD Rp RD E 12fiB406.27 3. BEDDING AND BACKFILL IN PIPE TRENCHES PER DETAIL C4.0 SDCO 2 _ 257 FCC: 258.50 RIM: 257 84 - -8! LF 8" PVC 2.1036 1 4, ENSURE POSITIVE DRAINAGE MAINTAINED AWAY FROM PORTABLES. SOIL SHALL NOT BE PLACED 8" IE: 255;17 2.5• AGAINST SKIRTING, .. B" IE: 253.30i 5. ALL EXCESS SOIL MATERIAL AND CONSTRUCTION WASTE SHALL BE DISPOSED OF AT AN APPROVED 20 LF 8"PVC @ 11,0 % IV OFF -SITE LOCATION. R 6. RESTORE IRRIGATION IN DISTURBED VEGETATION AREAS. 7. RESTORE DISTURBED LAWN AREAS WITH TOPSOILAND HYDROSEED PER HYROSEEDING NOTES ON 2610' SHEET C20. CB -TYPE 1 8, ANY PAVEMENT DAMAGED DURING CONSTRUCTION SHALL BE REPLACED IN -KIND BY THE WITH SOLID LOCKING LID CONTRACTOR, N 110454.64 - E126840776 GRAPHIC SCALE 9. COMPACTED STRUCTURAL FILL MEETING WSDOT 9-03,14(1)SHALL BE PLACED TO RAISE THE GRADE RIM: 254 83 BENEATH THE PORTABLE, B" IE: 252.10 0 5 10 20 1"= 10 FEET Know whafs below. Call before you dia. KEYNOTES LEGEND ODOWNSPOUT. CONNECT TO ROOF DRAIN LINE PER DETAIL 0 ROOF DRAIN LINE RD 3 O2 ASPHALT PAVEMENT PER DETAIL 9 HOT TAR SEAL JOINT. ASPHALT CONCRETE PAVEMENT G 0 OPORTABLE CLASSROOM, LANDING, RAMP AND STAIRS PER e PERMIT NO. XXXXXXXXXXXXXXXX MANUFACTURER'S DRAWINGS. STORM DRAIN CLEANOUT C4.0 OSTANDARD DISPERSION TRENCH WITH NOTCHED GRADE BOARD PER fi DETAIL 6 STANDARD DISPERSION TRENCH WITH C4.0 NOTCHED GRADE BOARD ca.D APPROVED et, 0,m 0 TACOMA • SEATTLE • SPOKANE • TRI-CIT IF 2215 North 300r Street, SuOe 300 Tacoma, WA 98403 2533832422 TEL 2533632572 FAX wewahbl.= WEB Pro1.g1 TIIim FWPS 2015 PANTHER LAKE ELEMENTARY SCHOOL MODULAR Client: FEDERAL WAY PUBLIC SCHOOLS 33330 8TH AVENUE SOUTH FEDERAL WAY, WA 98003 JASON NELSON Jc�b ,9 2150238 10 lalL O PERMIT SET AUGUST 7. 2015 wrkm n.rt re n Revisions: Sheet Title: CIVIL SITE PLAN Designed bv: Drawn bv: Checked by: Sheet No. C3.0 3 of 4 Sheets DATE: August 6, 2015 FILENAME: W20152150238N0_CIVACAD\215023BSH-SITE dwg r"WPS 2015 PAN'i HER LAKE ELEMENTARY SCHOOL MODULAR A PORTION OF THE NE. 1/4 OF THE NW. 1/4 OF THE SW. 1/4 OF SEC. 20, TWP. 21 N., RGE. 4 E., W.M. KING COUNTY, WASHINGTON NOTES: FILTER FABRIC MATERIAL (ORANGE) MIRAFI 100 NS OR EQUIVALENT 2" X 2" BY 14 GA YORE FABRIC OR EQUIVALENT, AFFIX TO POST PROVIDE 3/4" -1 112" WASHED GRAVEL BACKFILL IN TRENCH AND ON BOTH SIDES OF FILTER FENCE _ - FABRIC ON THE SURFACE I '_ - 2" X 4" WOOD POST OR STEEL FENCE POST 8 ORANGE FILTER FABRIC MATERIAL 60" WIDE ROLLS - USE RINGS TO ATTACH SIDE VIEW ATTACH TO WIRE FABRIC - -- c. T X 2" BY 14 GA EXISTING f _ WIRE FABRIC OR GRADE _ EQUIVALENT BURY BOTTOM OF FILTER MATERIAL _Z IN 6"X12" TRENCH ry 6' MAX 2" X 4" WOOD POSTS, STANDARD OR FRONT VFW BETTER, OR STEEL FENCE POST SILT FENCE 1 NOT TO SCALE ROOF DOWNSPOUT SEE ARCHITECTURAL DETAILS. 8" PVC CAP CUT HOLE TO ALLOW DOWNSPOUT TO PENETRATE WITH 1/8" CLEARANCE- jT4" M1N FINISH GRAa" PVC SCH 40 TYP. 8"CLEAN 1.00 MIN. 8" PVC PROVIDE FITTINGS AS REQUIRED DOWNSPOUT CONNECTION 4 NOT TO SCALE o` Know what's below. Call hefare you dia 1, THE FILTER FABRIC SHALL BE PURCHASED IN A CONTINUOUS ROLL CUT TO THE LENGTH OF THE BARRIER TO AVOID USE OF JOINTS WHEN JOINTS ARE NECESSARY, FILTER CLOTH SHALL BE SPLICED TOGETHER ONLY AT ASUPPORT POST WITH A MINIMUM SIX-INCH OVERLAP, AND BOTH ENDS SECURELY FASTENED TO THE POST. 2. THE FILTER FABRIC FENCE SHALL BE INSTALLED TO FOLLOW THE CONTOURS (WHERE FEASIBLE). THE FENCE POSTS SHALL BE SPACED A MAXIMUM OF SIX FEET APART AND DRIVEN SECURELY INTO THE GROUND (MINIMUM OF 30") 3. ATRENCH SHALL BE EXCAVATED, ROUGHLY EIGHT INCHES WIDE AND TWELVE INCHES DEEP, UPSLOPE AND ADJACENT TO THE WOOD POST TO ALLOW THE FILTER FABRIC TO BE BURIED. 4. WHEN STANDARD STRENGTH FILTER FABRIC IS USED, A WIRE MESH SUPPORT FENCE SHALL BE FASTENED SECURELY TO THE UPSLOPE SIDE OF THE POSTS USING HEAVY-DUTY WIRE STAPLES AT LEAST ONE INCH LONG, TIE WIRES, OR HOG RINGS, THE WIRE SHALL EXTEND INTO THE TRENCH A MINIMUM OF FOUR INCHES AND SHALL NOT EXTEND MORE THAN THIRTY SIX INCHES ABOVE THE ORIGINAL GROUND SURFACE 5. THE STANDARD STRENGTH FILTER FABRIC SHALL BE STAPLED OR WIRED TO THE FENCE, AND TWENTY INCHES OF THE FABRIC SHALL BE (EXTENDED INTO THE TRENCH. THE FABRIC SHALL NOT EXTEND MORETHAN THIRTY SIX INCHES ABOVE THE ORIGINAL GROUND SURFACE FILTER FABRIC SHALL NOT BE STAPLED TO EXISTING TREES 6, WHEN EXTRA -STRENGTH FILTER FABRIC AND CLOSER POST SPACING ARE USED, THE WIRE MESH SUPPORT FENCE MAY BE ELIMINATED, IN SUCH A CASE, THE FILTER FABRIC IS STAPLED OR WIRED DIRECTLY TO THE POSTS WITH ALL OTHER PROVISIONS OF STANDARD NOTE (S) APPLYING. 7- THE TRENCH SHALL BE BACKFILL WITH 3/41NCH MINIMUM DIAMETER WASHED GRAVEL, 8, FILTER FABRIC FENCES SHALL BE REMOVED WHEN THEY HAVE SERVED THEIR USEFUL PURPOSE, BUT NOT BEFORE THE UPSLOPE AREA HAS BEEN PERMANENTLY STABILIZED. 9, FILTER FABRIC FENCES SHALL BE INSPECTED IMMEDIATELY AFTER EACH RAINFALL AND AT LEAST DAILY DURING PROLONGED RAINFALL. ANY REQUIRED REPAIRS SHALL BE MADE IMMEDIATELY. 10, CONTRIBUTING LENGTH TO FENCE SHALL NOT BE MORE THAN 100 FEET 11. DO NOT INSTALL BELOW AN OUTLET PIPE OR WEIR 12. DO NOT DRIVE OVER OR FILL OVER FILTER FABRIC FENCE DRILL AND TAP (SPLI THE SEAM) SET MADE DOWN WITH 318" SS P HEAD BOLTS - 2 PI 1/8" RAISE - IW WIDE BORDER —4 H 1" STORM SEWER LETTERING "STORM" UM RIGID r FLEXIBLE (D.I„ CONIC.) (CPEP, CMP, PVC) - BACKFILL PAVED AREAS AND SUBGRAW ELEVATION WITHIN RO.W. CRUSHED SURFACING TOP COURSE, WSDOT 9-03.9(3) 95 COMPACTION, 6" MAXIMUM LIFTS. NATIVE MATERIAL MAY BE USED IF IT MEETS THE REQUIREMENTS OF STRUCTURAL FILL AND PI PE AS COMPACTION CAN BE ACHIEVED SPECIFIED ON AS APPROVED BY THE PLANS GEOTECHNICAL ENGINEER { BACKFILL UNPAVED AREAS NATIVE MATERIAL OR GRAVEL G d BACKFILL FOR PIPE BEDDING, • a` RE�UBM3I I FU SEP 0 8 2015 CITY OF FEDERAL WAY CDS L� HMACLASS 1/2", PG 64-22 N CRUSHEO SURFACING BASE COURSE PER WSDOT 9, 03-9(3) 12- COMPACTED SUBGRADE TO 95 90/ COMPACTION, 12 MAXIM LIFTS NOTE BACKFILL MATERIAL SHALL d 6 ' A • O NOTES: 1. ALL DEPTHS SHOWN ARE COMPACTED DEPTHS HAVE PARTICLE SIZE � . 1 A . y -- NOT 6" .e G d 0 2. THE CONTRACTOR SHALL EXPOSE EXISTING FILL, PROOF ROLL GREATER THAN 1" WITHIN c n a a - 7 4"MIN. AND COMPACT TO 9S%. IF YIELDING CONDITIONS ARE OF THE PIPE OR THE r. ENCOUNTERED. YIELDING MATERIALS SHALL BE REPLACED WITH CONTRACTOR HAS THE I I I I i GRAVEL BACKFILL IMPORTED STRUCTURAL FILL MATERIAL. THE DEPTH OF MATERIAL OPTION TO USE GRAVEL - FOR PIPE ZONE REPINT SHALL BE DETERMINED BY THE GEOTECHNICAL BACKFILL PIPE ZONE I D + 30" BEDDING PER ENGINEER BEDDING CONFORMING TO WSDOT 9-03.12(3), WSDOT 9-03.120 95% COMPACTION ASPHALT CONCRETE PAVEMENT SECTION BEDDING AND BACKFILL PIPE IN TRENCHES 3 NOT TO SCALE NOT TO SCALE NOTES: 1. PIPE MATERIAL PER PLAN 2 PIPE DIAMETER PER PLAN. 3 ABS TO PVC USE PVC ADAPTOR OR FERNCO W/STAINLESS STEEL CLAMPS OR APPROVED EQUAL 4 PVC TO CAST IRON OR CONCRETE USE FERNCO W/STAINLESS STEEL CLAMPS OR APPROVED EQUAL 10" I 1 3000 psi CLASS C T__ CONCRETE (TYP) 4 •4— 4-3/4" 12"B 7 411 FIBRE JOINT 7-314" PACKING 63M. 45" (1/8) BEND 15" CAST IRON RING AND LOCKING COVER PR0IAPE WATER ` ..... ... .....L�- TIGHT PLUG STORM DRAIN CLEANOUT NOT TO SCALE PIPE —{ 1 1 I� II II I O D END CAP OR PLUG CLEAN OUT WYE FROM PIPE 3" PERFORATED NOTCHED GRADE PIPE LAID FLATILEVEL BOARD 2"x2" NOTCHES 18" O,C TYPE 1 CB W/ SOLID LID COVEF (LOCKING) I A PER PLAN L GALVANIZED BOLTS 2"x12" PRESSURE TREATED GRADE 1' BOARD 12" MIN- R L A FLOW TO SECOND DISPERSAL TRENCH IF NECESSARY CB D COVER INFLUENT (MAX �_ NOTES: DESIGN FLOW s 0.5 CFS PER TRENCH) I 1, THIS TRENCH SHALL BE CONSTRUCTED SO AS TO — CLEAN OUT WYE FROM PIPE PREVENT POINT DISCHARGE Lj FLOWTOOTHER AND/OR EROSION BRANCHING CB'S AS 2 TRENCHES MAY BE PLACED NO NECESSARY CLOSER THAN 50 FEET TO ONE PIPE O D. 1B" J O,C, I ANOTHER (100 FEET ALONG FLOWUNE) 1 112" 3 TRENCH AND NOTCHED GRADE BOARD MUST BE LEVEL. ALIGN I T TO FOLLOW CONTOURS OF T 2" NOTHCES r T J SITE. 8" PERFORATED 4 SUPPORT POST SPACING AS PIPE LAID FLAT REQURED BY SOIL CLEAN (<5% FINES CONDITIONS TO ENSURE KI 1 Y"- 3/u" WASHED ROCK) GRADE BOARD REMAINS LEVEL FILTER FABRIC ZPERSION TRENCH WITH NOTCHED GRADE BOARD SCALE PERMIT NO. XXXXXXXXXXXXXXXX APPROVED Lip's M&A g� Ilan! TACOMA • SEATTLE • SPOKANE I -CITIES 2215 North 30Bt Strco eet. Suite 300 Tama, WA 98403 253.3932422 Ta 253.3832572 FAX w zhbl.cam WEB Prolect Tllla: FWPS 2015 PANTHER LAKE ELEMENTARY SCHOOL MODULAR c.nlL FEDERAL WAY PUBLIC SCHOOLS 33330 STH AVENUE SOUTH FEDERAL WAY, WA 98003 JASON NELSON Job No. 2150238.10 Issue Set 6 Date: PERMIT SET AUGUST 7, 2015 NOTICE Esv ra ww w ..aV a°ne Revisions: Sheet Title NOTES AND DETAILS Desloned bv: Or— by: Chocked bv: Sheet No. C4.0 4 of 4 Sheets DATE: August 6, 2015 FILENAME: 0:\2015Ul50238\10_CIV\CAD12150238SHSITE dwg w RESUBMITTED SEP 08 2015 CITY OF FLIJERAL WAY CDS '-1 c11� TACOMA13 SEATT L Technical Information Report PREPARED FOR: Federal Way Public Schools Attn: Jason Nelson 33380 8th Avenue South Federal Way, WA 98003 PROJECT. Federal Way Public Schools 2015 Panther Lake Elementary School Modular 34424 First Avenue South Federal Way, WA 98003 Project No. 2150238.10 PREPARED BY. - Anne M. Turpin, PE Project Engineer ;l -0 D REVIEWED BY: M �u Cn 0 M William J. Fierst, PE C �O C0 � w � Project Manager Sean M. Comfort, PE D m Principal z -0 rr1 u o DATE: Z D ( o August 2015 m p m F- M m z D Civil Engineers • Structural Engineers • Landscape Architects • Community Planners • Land Surveyors • Neighbors dais .. 8,1'6�2015 I hereby state that this Technical Information Report for the Federal Way Public Schools 2015 Panther Lake Elementary School Modular project has been prepared by me or under my supervision, and meets the standard of care and expertise that is usual and customary in this community for professional engineers. I understand that the City of Federal Way does not and will not assume liability for the sufficiency, suitability, or performance of drainage facilities prepared by me. Technical Information Report PREPARED FOR: Federal Way Public Schools Attn: Jason Nelson 33380 8th Avenue South Federal Way, WA 98003 PROJECT. Federal Way Public Schools 2015 Panther Lake Elementary School Modular 34424 First Avenue South Federal Way, WA 98003 Project No. 2150238.10 PREPARED BY.• Anne M. Turpin, PE Project Engineer REVIEWED BY' William J. Fierst, PE Project Manager Sean M. Comfort, PE Principal DATE: August 2015 Table of Contents Section Page 1.0 Project Overview............................................................................................................................1 2.0 Conditions and Requirements Summary....................................................................................2 2.1 Core Requirement 1 - Discharge at the Natural Location ................................................... 2 2.2 Core Requirement 2 - Offsite Analysis................................................................................ 2 2.3 Core Requirement 3 - Flow Control....................................................................................2 2.4 Core Requirement 4 Conveyance System....................................................................... 3 2.5 Core Requirement 5 - Erosion and Sediment Control........................................................ 3 2.6 Core Requirement 6 - Maintenance and Operations.......................................................... 3 2.7 Core Requirement 7 - Financial Guarantees and Liability .................................................. 3 2.8 Core Requirement 8 - Water Quality................................................................................... 3 2.9 Special Requirement 1 - Other Adopted Requirements..................................................... 3 2.10 Special Requirement 2 - Flood Hazard Delineation............................................................ 4 2.11 Special Requirement 3 - Flood Protection Facilities...............:...........................................4 2.12 Special Requirement 4 - Source Control............................................................................ 4 2.13 Special Requirement 5 - Oil Control...................................................................................4 3.0 Offsite Analysis..............................................................................................................................4 3.1 Task 1 — Study Area Definition and Maps........................................................................... 4 3.2 Task 2 — Resource Review................................................................................................. 4 3.3 Task 3 — Field Inspection.................................................................................................... 5 3.4 Task 4 — Drainage System Description and Problem Descriptions .................................... 5 3.5 Task 5 — Mitigation of Existing or Potential Problems......................................................... 5 4.0 Flow Control and Water Quality Facility Analysis and Design .................................................. 5 5.0 Conveyance System Analysis and Design.................................................................................. 6 6.0 Special Reports and Studies........................................................................................................ 6 7.0 Other Permits................................................................................................................................. 6 8.0 CSWPPP Analysis and Design..................................................................................................... 6 9.0 Bond Quantities, Facility Summaries, and Declaration of Covenant ....................................... 6 10.0 Operations and Maintenance Manual..........................................................................................6 Technical Information Report Federal Way Public Schools 2015 (UM130 Panther Lake Elementary School Modular Project No. 2150238.10 Appendices Appendix A Technical Information Report (TIR) Worksheet Exhibits A-1............. Vicinity Map A-2............. Soils Map A-3............. Civil Site Plan A-4............. Existing Basin Map A-5............. Developed Basin Map A-6............. Site Flow Rates A-7............. Conveyance Calculations A-8............. FEMA Flood Insurance Rate Map A-9............. King County iMAP Information Appendix B Operations and Maintenance Manual Technical Information Report 13MG0 Federal Way Public Schools 2015 Panther Lake Elementary School Modular Project No. 2150238.10 1.0 Project Overview Panther Lake Elementary School is located at 34424 1st Avenue South on Parcel No. 2021049110 in Federal Way, Washington (see Appendix A-1 for the Vicinity Map). The 2015 portable classroom project is proposing to install one double portable classroom, ramp, stairs, awning, and landings at Panther Lake Elementary School (see Appendix A-3 for the Civil Site Plan). This would result in 2,299 square feet of new impervious surface and zero (0) square feet of replaced impervious surface (total of 2,299 square feet of new plus replaced impervious surfaces). In addition, zero (0) square feet of impervious surface will be converted to pervious lawn. The site will realize a net increase of 2,299 square feet of impervious surfaces. See Appendices A-4 and A-5 for Existing and Developed Basin Maps. This project meets Full Drainage Review criteria per Section 1.1.2.3 of the 2009 King County Surface Water Design Manual (KCSWDM), as amended by the City of Federal Way Addendum to the King County Surface Water Design Manual, as the project will result in more than 2,000 square feet of new plus replaced impervious surface, but is not subject to Small Project Drainage Review. A gravel -filled trench for basic dispersion will be used to meet flow control Best Management Practice (BMP) requirements. The new double portable classroom (a total proposed roof area of 1,792 square feet) will include four downspout extensions connected to 8-inch drainpipes, which will discharge to a gravel -filled dispersal trench located at the bottom of the existing slope. Per Appendix C of the KCSWDM, a minimum 25-foot vegetated flow path is provided downstream of the trench, and the trench is sized at a ratio of 10 feet per 700 square feet of impervious surfaces. Federal Way School District has long-term plans of potentially building additional portable classrooms onsite. The number of additional portables, area of additional new impervious surfaces, and project schedule are not known at this time. Under the requirements of Section 1.2.3 of the KCSWDM, existing impervious surface added after January 8, 2001, that is not fully dispersed and not mitigated by an approved facility is considered a target surface subject to flow control requirements. The applicant understands that this requirement could necessitate construction of additional flow control improvements to mitigate for the current proposed portable classroom, in the event that additional portable classrooms are constructed. Under the requirements of Federal Way Revised Code (FWRC) Sections 16.25.010 and 19.30.120, redevelopment that involves the creation or addition of 5,000 square feet or more of new or replaced impervious surfaces results in the requirement to bring existing property improvements into compliance with water quality regulations in place at the time of redevelopment. The applicant understands that this requirement could necessitate construction of additional water quality improvements to mitigate for all existing site improvements, as well as the current proposed and any future proposed portable classrooms, in the event that additional portable classrooms are constructed. One portable classroom was constructed at the site in 2014. Impervious surfaces totaling 2,300 square feet were constructed at the site. The cumulative new impervious surfaces added between 2014 and 2015 total 4,599 square feet. Therefore, more than 5,000 square feet of impervious surfaces have not been created. Construction of additional flow control and water quality improvements is not required at this time. Technical Information Report D Federal Way Public Schools 2015 Panther Lake Elementary School Modular 1 Project No. 2150238.10 2.0 Conditions and Requirements Summary 2.1 Core Requirement 1 - Discharge at the Natural Location The natural discharge location for stormwater from the work area is the lawn area at the bottom of the existing hill, southeast of the proposed portable, which discharges to an offsite wooded area that contains at least one existing wetland. Stormwater roof runoff from the new portable will be discharged from the roof with downspouts connected to 8-inch drain lines. The 8-inch drain lines convey water to the bottom of the existing slope and discharge to a gravel -filled dispersion trench. All surface and stormwater runoff from the proposed development will continue to be discharged at the natural location, and thus will not adversely affect downstream properties or drainage systems. 2.2 Core Requirement 2 - Ofisite Analysis AHBL staff performed a Level One Downstream Analysis for the project on April 10, 2015. The analysis included: • Defining and mapping the study area. • Reviewing available information on the study area. ■ Field inspecting the study area. ■ Analyzing the existing drainage system, including its existing and predicted problems, if any. Please refer to Section 3.0 for the full offsite analysis. 2.3 Core Requirement 3 - Flow Control The project site lies in the Conservation Flow Control Area (CFCA), according to the King County Flow Control Application Map of the KCSWDM. Projects in the CFCA are subject to Level 2 Flow Control. This project meets Exception 2 for CFCA because there is no more than a 0.1 cfs difference in the sum of developed 100-year peak flows for those target surfaces subject to this requirement and the sum of historic site conditions 100-year peak flows for the same surface areas. See pre- and post -developed peak flow rates in Appendix A-6. The project qualifies under Large Lot Low Impervious BMP Requirements per Section 5.2.1.2 of the KCSWDM. The feasibility and applicability of full dispersion was evaluated. The required 100-foot flow path to the edge of the property is not available; therefore, full dispersion is not applicable. Basic dispersion was evaluated from the list of applicable BMPs in Section 5.2.1.2(3) of the KCSWDM. However, rock pads are not feasible due to the requirement that they be a minimum of 50 feet apart. Full infiltration of roof runoff was evaluated. Per USGS Soils Maps, Everett-Alderwood gravelly sandy loam (EwC) soils are likely present on the site (see Appendix A-2 for the Soils Map). The geotechnical report prepared in 2008 for this site indicated that the sire has seasonal perched groundwater above underlying impermeable till soil layers. The 2008 Panther Lake Elementary School Technical Information Report (TIR), which includes the geotechnical report, was previously submitted with the 2014 portable project. Technical Information Report 131DE10 Federal Way Public Schools 2015 Panther Lake Elementary School Modular 2 Project No. 2150238.10 Basin dispersion was selected from the list of applicable BMPs in Section 5.2.1.2(3) of the KCSWDM. Gravel -filled trenches for basic dispersion were selected as the dispersion device for the roof drain runoff according to Section C 2.4.4 of the KCSWDM, which states that gravel trench size shall be designed at a ratio of 10 feet per 700 square feet of impervious area tributary to the trench. Impervious surface in the amount of 1,792 square feet is tributary to the trench, requiring 26 linear feet (1,792 / 700 = 2.56). The grass -vegetated flow path segment exceeds the minimum requirement of 25 feet. 2.4 Core Requirement 4 - Conveyance System The conveyance system proposed for this project consists of the roof drains connecting to the dispersal trench. The smallest pipe with the flattest slope was chosen to verify that the pipe is capable of conveying the largest 100-year flow (see Appendix A-7). 2.5 Core Requirement 5 - Erosion and Sediment Control Onsite land disturbance will be very minimal and will consist of clearing the work site, (approximately 5,817 square feet), making adjustments to the existing grade below the portable, the installation of the roof drain lines, and the construction of the gravel -filled dispersal trench. Erosion and sediment control will be provided with the use of temporary and permanent seeding within the work limits and existing grass areas downstream of the site, silt fence or wattles, and catch basin inlet protection. A Temporary Erosion and Sedimentation Control Plan has been included in the plan set. 2.6 Core Requirement 6 - Maintenance and Operations All drainage facilities will be maintained and operated by the owner. The dispersion trench may require minimal maintenance. An Operations and Maintenance Manual is attached to this report (see Appendix B). The catch basin will have a solid locking lid, and the only runoff contributing to the gravel -filled dispersal trench originates from rooftop surfaces. 2.7 Core Requirement 7 - Financial Guarantees and Liability No flow control, water quality, conveyance, erosion control, or road drainage facilities are being proposed for this development; therefore, this requirement does not apply to this development. 2.8 Core Requirement 8 - Water Quality No pollution generating surfaces are proposed as part of this development; therefore, the development meets the Surface Area Exemption and this requirement will not apply. According to FWRC Section 19.30.120, the addition of more than 5,000 square feet of new or replaced impervious surfaces results in a requirement to provide water quality improvements for all existing pollution generating surfaces, meeting the requirements in place at the time of redevelopment, as cited in FWRC Chapter 16. The project is proposing less than 5,000 square feet of new plus replaced impervious surfaces, as documented in Section 1.0 of this report, and therefore is not subject to this requirement at this time. 2.9 Special Requirement 1 - Other Adopted Requirements No adopted requirements apply to this project. Technical Information Report IMMID0 Federal Way Public Schools 2015 Panther Lake Elementary School Modular 3 Project No. 2150238.10 2.10 Special Requirement 2 - Flood Hazard Delineation The proposed project is not in or adjacent to the 100-year floodplain. 2.11 Special Requirement 3 - Flood Protection Facilities This project does not rely on existing flood protection facilities, nor will it modify or construct new flood protection facilities. 2.12 Special Requirement 4 - Source Control This project does not require a commercial building or commercial site development permit, and therefore does not require source controls. 2.13 Special Requirement 5 - Oil Control The site does not meet high use criteria and is not subject to oil control measures. 3.0 Offsite Analysis 3.1 Task 1 — Study Area Definition and Maps Panther Lake Elementary School proposes to place one new portable building on the 11.15-acre site located at 34424 V' Avenue South in Federal Way, Washington. The project site lies within the Hylebos Creek Drainage Basin, as delineated by the King County Water Features Map. There are no wetlands on the project site. A small, delineated wetland does exist offsite to the east of the project area. The wetland is located approximately 105 feet east of the proposed portable. It was originally delineated by Otak in 2008 and confirmed by the City of Federal Way to be a 1,406-square foot, Category II, non -jurisdictional wetland because it is less than 2,500 square feet in size, in accordance with Federal Way City Code (FWCC) 22-1357(a)(2). A summary of the site conditions and findings on June 24, 2015, includes the following: The wetland is in a depression, with a human -constructed swale located in the southeast portion. A permitted storm outfall from the school is located approximately 50 feet north of the wetland. The wetland is a Palustrine scrub -scrub, emergent system. Trees are not rooted in the wetland, but provide approximately 50 percent cover to the wetland system. The original wetland has increased by 112 square feet for a total size of 1,518 square feet. It is still a Category II, non - jurisdictional wetland because it does not exhibit Category I wetland characteristics, is less than 2,500 square feet in size, is less than 1 acre in size in its entirety, and has two or more wetland classes, with neither class dominated by nonnative invasive species in accordance with FWCC 15.10.250. 3.2 Task 2 — Resource Review The following resources were reviewed to discover any existing or potential problems in the study area: Drainage Studies/Offsite Analysis Reports: Panther Lake Elementary School Technical Information Report prepared by Otak, Inc., November 12, 2008. Technical Information Report (DID133Federal Way Public Schools 2015 Panther Lake Elementary School Modular 4 Project No. 2150238.10 FEMA Map: FEMA Flood Insurance Rate Map 53033C1250F, dated May 16, 1995 (see Appendix A-8), indicates that the project site lies within Zone X — areas determined to be outside the 500-year floodplain. King County !MAP: The project site is not located in any of the following mapped critical areas (see Appendix A-9): 0 Coal Mine Hazard Areas 0 Erosion Hazard Areas 0 Landslide Hazard Areas o Seismic Hazard Areas o Critical Aquifer Recharge Areas 0 100-Year Flood Plain 0 Wetlands Soils Information: Site soils have been classified by the USDA Natural Resources Conservation Service (NRCS) as Alderwood gravelly sandy loam, 6 to 15 percent slopes (EwC) (see Appendix A-2). Associated Earth Sciences, Inc. prepared a Geotechnical Engineering Report for the project site in 2008, confirming the existence of Vashon Lodgement Till onsite. The resource review did not reveal any potential downstream drainage problems. 3.3 Task 3 — Field Inspection A site visit was conducted on April 10, 2015, by AHBL staff. No drainage problems were noted at the time of the site visit. 3.4 Task 4 — Drainage System Description and Problem Descriptions The point of discharge from the portable classroom improvements is an existing onsite lawn. The lawn area in the general vicinity of the proposed portable sheet flows east to an offsite forested area. Any offsite runoff continues to flow southeast through the forested area and a non - jurisdictional wetland to South 348th Street, under South 348�h Street in a culvert, and into the West Hylebos Wetlands Park. 3.5 Task 5 — Mitigation of Existing or Potential Problems No downstream drainage problems were identified in the downstream analysis. 4.0 Flow Control and Water Quality Facility Analysis and Design The project will not increase the 100-year peak flow rate from the forested condition to the proposed condition by more than 0.1 cfs, which exempts the project from flow control requirements, according to Exception 2 in Section 1.2.3.1(B) of the KCSWDM. Detailed calculations to demonstrate exemption from flow control have been included in Appendix A-6. Future improvements to the site, including additional portable classrooms, may require additional flow control improvements to mitigate for the currently proposed portable classroom. Under the requirements of Section 1.2.3 of the KCSWDM, existing impervious surface added after January 8, 2001, that is not fully dispersed and not mitigated by an approved facility is considered a target surface subject to flow control requirements. The impervious surface added by this project needs to be included in flow control calculations for future onsite improvements requiring mitigation to meet the requirements in place at the time of redevelopment. Technical Information Report M1000 Federal Way Public Schools 2015 Panther Lake Elementary School Modular 5 Project No. 2150238.10 See Section 2.8 above for the Water Quality Analysis. Future improvements to the site, including additional portable classrooms, may require additional water quality improvements to mitigate for any existing onsite pollution -generating surfaces not meeting water quality regulations in place at the time of future redevelopment. According to FWRC Section 19.30.120, redevelopment resulting in 5,000 square feet of new or replaced impervious surface results in a requirement to provide water quality improvements for all existing pollution generating surfaces, meeting the requirements in place at the time of redevelopment, as cited in FWRC Chapter 16. The project is proposing less than 5,000 square feet of new plus replaced impervious surfaces, as documented in Section 1.0 of this report, and therefore is not subject to this requirement at this time. Construction of additional portable classrooms has been considered by the School District, but has not been committed to. In the event that additional portable classrooms or other onsite improvements resulting in added or replaced impervious surfaces are constructed, water quality improvements meeting the requirements in place at that time may be required for existing pollution -generating surfaces not meeting the requirements in place at that time. 5.0 Conveyance System Analysis and Design The only drainage structure is the line to the infiltration trench. Calculations to confirm the geometry of the conveyance pipe are included in Appendix A-7. 6.0 Special Reports and Studies The need for special reports or studies is not anticipated at this time. 7.0 Other Permits No other permits are required as part of this proposed development according to Sections 2.3.1.1 or 1.1.3 of the KCSWDM. 8.0 CSWPPP Analysis and Design See Section 2.5 above for Core Requirement 5, Erosion and Sediment Control. 9.0 Bond Quantities, Facility Summaries, and Declaration of Covenant See Section 2.7 above for Core Requirement 7, Financial Guarantees and Liability. 10.0 Operations and Maintenance Manual The project proposes a new drainage facility, the infiltration trench, to operate and maintain (see Appendix B for the Operations and Maintenance Manual). Technical Information Report 610130 Federal Way Public Schools 2015 Panther Lake Elementary School Modular 6 Project No. 2150238.10 This analysis is based on data and records either supplied to or obtained by AHBL. These documents are referenced within the text of the analysis. The analysis has been prepared using procedures and practices within the standard accepted practices of the industry. AHBL, Inc. Anne M. Tur�PE= Project Engineer AMT/Isk August 2015 Q:\2015\2150238\WORDPROC\Reports\20150806 Rpt (TIR) 2150238.10.docx Technical Information Report (DIDE30 Federal Way Public Schools 2015 Panther Lake Elementary School Modular 7 Project No. 2150238.10 Appendix A Technical Information Report (TIR) Worksheet Exhibits A-1....................Vicinity Map A-2.................... Soils Map A-3.................... Civil Site Plan A-4.................... Existing Basin Map A-5.................... Developed Basin Map A-6.................... Site Flow Rates A-7.................... Conveyance Calculations A-8.................... FEMA Flood Insurance Rate Map A-9.................... King County iMAP Information Technical Information Report 131000 Federal Way Public Schools 2015 Panther Lake Elementary School Modular Project No. 2150238.10 VICINITY MAP NOT TO SCALE 0003 TACOM A SEATTLE 2215 North 30th Street, Suite 300, Tacoma, WA 98403 1200 6th Avenue, Suite 1620, Seattle, WA 90101 Civil Engineers Structural Engineers Landscape Architects Community Planners LandSurveyors Neighbors 253.383.2422 TEL 206.267.2425 TEL PANTHER LAKE ELEMENTARY SCHOOL SITE IMPROVEMENTS VICINITY MAP EXHIBIT Awl USDA United States Department of Agriculture N RCS Natural Resources Conservation Service A , Juct of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom' oil Resource Report for King County Area, Washington A-2 May 9, 2014 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/portal/ nres/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (http:// offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means A-2 K for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. A-2 3 Contents Preface....................................................................................................................2 SoilMap..................................................................................................................5 SoilMap................................................................................................................6 Legend..................................................................................................................7 MapUnit Legend..................................................................................................8 MapUnit Descriptions..........................................................................................8 King County Area, Washington.......................................................................10 EwC—Everett-Aiderwood gravelly sandy loams, 6 to 15 percent slopes .... 10 References............................................................................................................12 A-2 4 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. A-2 5 A V yvy� W O� Z Z 122° 20' 1" W z o vv[1 O ((�FSFjj,QQ' � N N V 33� O � 0 6i p N 8 O N X a0 v WW O N N� O N O Z VLl O 122° 20' 1' W CD cn w O � C CD N CD O 9 O O O o N N 122° 1951" W 122° 19' 51" W 5237850 5237870 5237M 523-1910 5237930 573/950 M-1970 A-2 y W N Z' Z CD 0 � 3 Cn cn cn (n (n to A v r r 4� L7 (� n m Oo M ? w ti CO m D W m O ° T T - m m a [n m Obi n�i a�i o D — MO O ° m C c N s. N a O m o - m a c c 'm v c O o o m ° m N f m 0'm ° ° 7 ° W �o CC 3 N co r T G G _0 O 7 N O a N o N o v D M r M '. m m cq ep ms d mIOUm v v" -0 7 N m y Cm7 E ^? ° A A C 6i c 3 mcn (n c y m y y m 'a o m ro N w S n m cn '0 o@ S (n f0 N 3 o s K)d 0 o cc 7 s CD 0 >rL Qra 07 c��cn O O 3 m ov 3 m •7 -i 7' 3 m �' � y Ol - (O m Z- c < m m� n W N y y a �, O O' c - fD m M c CO .m rn 0 v 3 m 7' m O , a c m c `< D o. a OC-1 n C r m j m y o. 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N 0 O w -Z m= < 01 O m n c m i O O < N <c O D O 07 @ m O D m c .0« N -7 m O- f/1 m m C*D n O m 0 n w 3 0 O C T m y N 7 m U) 01 o CI W N o U7 O 7 'm Sv O' .0 0- d m O y (� 3 0) C) 01 S-0 N m '2. m d D O /v ic m o ma m rv� D �'am as �c v o 3c7o 0- y D C 3 07 -« y Z a M z 0 M Cr �M m y m m d 3 m L W? 0 c ai -0 7 Gj � Z m � m 0_ w v m O y m m O G C f0 3 0) f0 V) 0 07 m� N Q m cc 7 p1 y n C .m•. fD M U _. 0) m 3 01 Z 3 Ort 7 m CL 07 rt f/1 7 O 0 y n O O (p - m O 0 m 7. m 3 y a.m 0 C(a y CD d 2 'O y-@ m `0< 7 m N 3 C enO 7 I (mil CL O- �p � 0 �m 0 O m 01 O 7 0 m O-w S m c CT 01 C) y y d < co N p y A m f0 IV O N c m O 7- m O C,f0 CDfp M CDf0 OF, n c N O 2T N CD ca 0 c 1 ci CT N CD 0 Custom Soil Resource Report Map Unit Legend King County Area, Washington (WA833) Map Unit Symbol Nap Unit Name Acres in AOI Percent of AOI EwC Everett-Alderwood gravelly 3.3 100.0% sandy loams, 6 to 15 percent slopes Totals for Area of Interest 3.3 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. A-2 Custom Soil Resource Report An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha - Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. A-2 l) Custom Soil Resource Report King County Area, Washington EwC—Everett-Alderwood gravelly sandy loams, 6 to 15 percent slopes Map Unit Setting Elevation: 50 to 800 feet Mean annual precipitation: 25 to 60 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 180 to 220 days Map Unit Composition Alderwood and similar soils: 45 percent Everett and similar soils: 45 percent Minor components: 5 percent Description of Everett Setting Landform: Terraces Parent material: Glacial outwash with a component of volcanic ash in the upper part Typical profile H1 - 0 to 17 inches: moderately acid, gravelly ashy sandy loam H2 - 17 to 32 inches: moderately acid, very gravelly sandy loam H3 - 32 to 60 inches: slightly acid, very gravelly coarse sand Properties and qualities Slope: 6 to 15 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Somewhat excessively drained Capacity of the most limiting layer to transmit water (Ksat): High (1.98 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water storage in profile: Low (about 5.0 inches) Interpretive groups Farmland classification: Not prime farmland Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 3e Hydrologic Soil Group: A Other vegetative classification: Unnamed (G002XN402WA) Description of Alderwood Setting Landform: Moraines, till plains Parent material. Basal till with some volcanic ash Typical profile H1 - 0 to 12 inches: moderately acid, gravelly ashy sandy loam H2 - 12 to 27 inches: moderately acid, very gravelly sandy loam H3 - 27 to 60 inches: moderately acid, very gravelly sandy loam Properties and qualities Slope: 6 to 15 percent Depth to restrictive feature: 24 to 40 inches to densic material A-2 10 Custom Soil Resource Report Natural drainage class: Moderately well drained Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately low (0.00 to 0.06 in/hr) Depth to water table: About 18 to 37 inches Frequency of flooding. None Frequency of ponding: None Available water storage in profile: Very low (about 2.5 inches) Interpretive groups Farmland classification: Not prime farmland Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4s Hydrologic Soil Group: B Other vegetative classification: Unnamed (G002XN302WA) Minor Components Norma Percent of map unit. 2 percent Landform: Depressions Seattle Percent of map unit 2 percent Landform: Depressions Tukwila Percent of map unit. 1 percent Landform: Depressions A-2 11 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/nres/ detail/national/soils/?cid=nres142p2_054262 Soil Survey Staff.1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http://www.nres.usda.gov/wps/portal/ nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http://www.nres.usda.gov/wps/ portal/nres/detail/national/soi Is/?cid=nres 142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepasture/?cid=stelprdb1043084 A-2 12 Custom Soil Resource Report United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/ n res/detail/soils/scientists/?cid=nres 142p2 _054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www. nres. usda.gov/wps/portal/nres/detail/national/soils/? cid=nres l 42p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. 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"MS 3H1-A4 V 'MN 3Hl -AO V4 '3N 3H.1 =10 NOIIHOd V 53113X I Od - '100HOS kNVIN3W313 3>'h.- II I13H1Nbd ,-) stem r wH dVW NISVS (33dOl3 SLOz 'z-LsnE)1V 13S 1IW213d mull I Jos —9 oceezo%z TWQeF NOSI3N Nosvr e00e6 VM'/.VM 1VH303d H-LnOS 3nN3AV Hle OEEee S100HOS onand AVM 1VH3a3d avinaow LOOMS ANV1N3W313 3NVd1 93H1NVd SM SdM:l mmr-lopmm 3M wm Ig4e� xvi ZISZ=mz l3L zzoreee C9Z M VM'ewaoel o0E al.nS jaegS 410E 4NoN 9VZ 31110-Ni • 3NVHOdS • 3111V3S • VINOOVI 0 In foul '. all 0110 3ury '6!P noA ajo;aq lle3 'Molaq sav4m Mourn amoaaav Q XXXXXXXXXXXXXXXX 'ON llW83d (gov=v ns i-mmv.) snOIAN3MI 03SOdOHd 133d OZ=.L o0 oz W o 31VOS OIHdVNO N' ES`ir"Z' dfiiPi 4� �#L iC'i&S G3S (!ri' S jiy F.37 �Sr aN3931 N0IJNIHS►dM `AlNnoo MIN owmm `"3 V '30H "N ! Z "dMl `OZ A33S =10 M 'MS 3H1 J0 V 'MN 3H13O V4 03N 3H1 =10 N0I1Mad d zjvin0m_ 100HOS J HVIN3W313 3MVI M36 ANVd 9 WZ SdA _A S9'..GZli^E 5S rain �= -7-\ E N txdi" w ..• tee...-.J� .�•` fl ! aS zc v BUS l+t' -J --)oryt KCRTS Program ... File Di c:\kc swdm\kc DATA\ [C] CREATE a new Time Series ST 0.05 0.00 0.000000 Till Forest 0.00 0.00 0.000000 Till Pasture 0.00 0.00 0.000000 Till Grass 0.00 0.00 0.000000 Outwash Forest 0.00 0.00 0.000000 Outwash Pasture 0.00 0.00 0.000000 Outwash Grass 0.00 0.00 0.000000 Wetland 0.00 0.00 0.000000 Impervious pre.tsf T 1.00000 T [T] [P] pre.tsf pre. pks [R] [C] ST 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0:05 post.tsf T 1.00000 T [T] Enter the Analysis [P] Compute PEAKS and F1 post.tsf post.pks [R] RETURN to Previous Menu [X] eXit KCRTS Program Flow Frequency Analysis Time Series File:pre.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates --- Flow Rate Rank Time of Peak (CFS) 0.003 2 2/09/01 15:00 0.001 7 1/05/02 17:00 0.003 3 2/28/03 3:00 0.000 8 12/28/03 21:00 0.002 6 1/05/05 8:00 0.003 4 1/18/06 22:00 0.002 5 11/24/06 4:00 0.004 1 1/09/08 6:00 Computed Peaks Flow Frequency Analysis Time Series File:post.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates --- Flow Rate Rank Time of Peak (CFS) 0.012 7 2/09/01 2:00 0.011 8 1/05/02 16:00 0.015 3 12/08/02 18:00 0.012 6 8/26/04 2:00 0.015 4 10/28/04 16:00 0.013 5 1/18/06 16:00 0.018 2 10/26/06 0:00 0.023 1 1/09/08 6:00 Computed Peaks Enter the Analysis TOOLS Module Compute PEAKS and Flow Frequencies RETURN to Previous Menu CREATE a new Time Series 0.00 0.000000 Till Forest 0.00 0.000000 Till Pasture 0.00 0.000000 Till Grass 0.00 0.000000 Outwash Forest 0.00 0.000000 Outwash Pasture 0.00 0.000000 Outwash Grass 0.00 0.000000 Wetland 0,00 0.000000 Impervious TOOLS Module ow Frequencies -----Flow Frequency Analysis------- - - Peaks - - Rank Return Prob Period 0.0041 1 100.00 0.990 C.003 2 25.00 0.960 0.003 3 10.00 0.900 0.003 4 5.00 0.800 0.002 5 3.00 0.667 0.002 6 2.00 0.500 0.001 7 1.30 0.231 0.000 8 1.10 0.091 0.004 50.00 0.980 -----Flow Frequency Analysis------- - - Peaks - - Rank Return Prob (CFS) Period 0.023 1 100.00 0.990 0.018 2 25.00 0.960 0.015 3 10.00 0.900 0.015 4 5.00 0.800 0.013 5 3.00 0.667 0.012 6 2.00 0.500 0.012 7 1.30 0.231 0.011 8 1.10 0.091 0.022 50.00 0.980 From the KCRTS program (See Appendix 6) the maximum flow rate on -site is 0.023 cubic feet per second. The smallest pipe with the flattest slope is an 8-inch diameter pipe with 2.1% or 0.0210 This calculation demonstrates that the smallest flattest pipe on the site is capable of conveying the largest 100-year flow from the entire proposed area. No additional calculations have been provided. The calculation provides a conservative assumption because this pipe has a lower slope. Q = AV = (A/n) x Rh2/3 x Sl/Z r = 0.33 ft A = 7c rZ Rh = A/PW = 7Lr2/27cr = r/2 Smin = 0.021 n = 0.013 Qsystem = 1.28 cfs Qreq-d = 0.023 cfs The system provides 5551% of the flow capacity required for this project. A-7 A-1 HOME NEWS SERVICES KCGI:� Zenter DIRECTORY CONTACTSearch Terms: F earch iCCGIS Parcel Deports Districts and Development Conditions Report F Find Your Council District Find Your Watershed KCGIS Center j ing County GIS Center {irig Street Center 201 S..lackson St. Sulte 706 Seattle, WA 98104 gissaenter( ]singicounty qov 47,59909 N 122.33136 W 47' 35' 56.72° - 122' 19' 51.90" v%wN.KingCounty.gov/G IS King County Districts and Development Conditions for parcel 2021049110 Parcel number 2021049110 Drainage Hylebos Creek Address 344241STAVE Basin S Watershed Puyallup River Jurisdiction Federal Way WRIA Puyallup-W_bit_e_ Zipcode _ 98003 10 Kral] Map page 736 PLSS SW - 20 - 21 - 4 Thomas Guide 744 Latitude - 47.29443 gage Longitude -122.33339 Electoral Districts Voting district FED 30-3003 K3_'nc Coun Council_dlstricl District 7, Pete von Relchbauer 71 Fire district South King Fire and Rescue Water district does not apply Sewer district does not apply (206) 296-1007 L ffos6i — _ Water &Sewer district Lakehaven Utility District 9 Parks & Recreation does not apply Congressional district ••• district Legislative district 30 Hospital district does not apply School district -•••--• -- Federal War 210 - ...... ••••-•-••-_— — Rural library district Rural King County Library Seattle school board district does not apply (not in System Seattle) r _, , _ , M_ King Countypllanning and critical areas designations King County zoning NA, check with jurisdiction Development condition's None Comprehensive Plan does not apply Urban Growth Area Urban ggmmunity Senrice Area^ does not apply Communit Planning Area Federal Way Coal mine hazards? None mapped hazards? Y None mapped _Erosion Landslide hazards? None mapped — Seismic hazards? None. mapped Potential annexation area does not apply ^mural town? No --------------- Water service planning are@ � � does not apply Roads MPS zone 252 and 256 Trans ortation Concurrent does not apply Managegment Forest Production district? No Agricultural Production district? No Critical aquifer recharge area? .. None mapped 100-year flood plain? None mapped Wetlands at this parcel? None mapped Within the Tacoma Smelter Non -Detect to 20.0 Plume? pprn Related resources .... ....... .... ....... ...... __ __-__ .W_..... King County Assessor: eReal Propefty Report King County Assessor: Quarter Section Map (PDF format requires Acrobat) King County DPER: Permit Applications Report (for unincorporated areas only) King County Treasury Operations: Property Tax information for this property King County Recorders Office: Scanned images of plats. King County Recorders Office: Scanned images of surveys and other map documents,. Seattle/King County Public Health: Septic s stem as -built documents. Dyer€_ MAP,to_this..properf& Open Parcel Viewer to this property A-9 Search r Addr, )r parcel number: _ Go Reset search by condo name example address: 8621 428TH AVE SE I example parcel number: 0942000860 This report was generated on 519/2014 3:27:42 Ply Home Privacy I Accessibility I T$rms of usSearch Contact us at giscenterakirlccoun!y.c; . Links to external sites do not constitute endorsements by King County. By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site. © 2013 King County We Appendix B Operations and Maintenance Manual Technical Information Report OW1313 Federal Way Public Schools 2015 Panther Lake Elementary School Modular Project No. 2150238.10 APPENDDC A MAINTr---�NCE REQUIREMENTS FOR FLOW CONTROT' "'�NVEYANCE, AND WQ FACILITIES NO.2 - INFILTRATION FACILITIES Maintenance Defector Problem Conditions When Maintenance Is Needed Results Expected When Component Maintenance Is Performed Site Trash and debris Any trash and debris which exceed 1 cubic Trash and debris cleared from site. foot per 1,000 square feet (this is about equal to the amount of trash it would take to fill up one standard size office garbage can). In general, there should be no visual evidence of dumping. Noxious weeds Any noxious or nuisance vegetation which Noxious and nuisance vegetation may constitute a hazard to County removed according to applicable personnel or the public. regulations. No danger of noxious vegetation where County personnel or the public might normally be. Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil, gasoline, concrete slurries or according to applicable regulations. paint. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Grass/groundcover Grass or groundcover exceeds 18 inches Grass or groundcover mowed to a in height. height no greater than 6 inches. Infiltration Pond, Top Rodent holes Any evidence of rodent holes if facility is Rodents removed or destroyed and or Side Slopes of acting as a dam or berm, or any evidence of dam or berm repaired. Dam, Berm or water piping through dam or berm via Embankment rodent holes. Tree growth Tree growth threatens integrity of dams, berms Trees do not hinder facility or slopes, does not allow maintenance access, performance or maintenance or interferes with maintenance activity. If trees activities. are not a threat to dam, berm, or embankment integrity or not interfering with access or maintenance, they do not need to be removed. Erosion Eroded damage over 2 inches deep where Slopes stabilized using appropriate cause of damage is still present or where there erosion control measures. If erosion is potential for continued erosion. Any erosion is occurring on compacted slope, a observed on a compacted slope. licensed civil engineer should be consulted to resolve source of erosion. Settlement Any part of a dam, berm or embankment that Top or side slope restored to design has settled 4 inches lower than the design dimensions. If settlement is elevation. significant, a licensed civil engineer should be consulted to determine the cause of the settlement. Infiltration Pond, Sediment If two inches or more sediment is present or Facility infiltrates as designed. Tank, Vault, Trench, accumulation a percolation test indicates facility is working or Small Basin at or less than 90% of design. Storage Area Infiltration Tank Plugged air vent Any blockage of the vent. Tank or vault freely vents. Structure Tank bent out of Any part of tank/pipe is bent out of shape Tank repaired or replaced to design. shape more than 10% of its design shape. Gaps between A gap wider than %-inch at the joint of any No water or soil entering tank sections, damaged tank sections or any evidence of soil particles through joints or walls, joints or cracks or entering the tank at a joint or through a wall. tears in wall Infiltration Vault Damage to wall, Cracks wider than Y.-inch, any evidence of Vault is sealed and structurally Structure frame, bottom, and/or soil entering the structure through cracks or sound. top slab qualified inspection personnel determines that the vault is not structurally sound. 2009 Surface Water Design Manual — Appendix A 1/9/2009 A-9 APPENDIX A MAINTENANCE REQUTT —NMNTS FLOW CONTROL, CONVEYANCE, ANT- ``rQ FACILITIES FNO. 5 - CATCH BASINS AND MANHOLES Maintenance Defect or Problem Component Structure Sediment Inlet/Outlet Pipe Condition When Maintenance is Needed Results Expected When Maintenance is Performed Sediment exceeds 60% of the depth from Sump of catch basin contains no the bottom of the catch basin to the invert sediment. of the lowest pipe into or out of the catch basin or is within 6 inches of the invert of the lowest pipe into or out of the catch basin. Trash and debris Trash or debris of more than % cubic foot No Trash or debris blocking or which is located immediately in front of the potentially blocking entrance to catch basin opening or is blocking capacity of catch basin. the catch basin by more than 10%. rash or debris in the catch basin that exceeds the depth from the bottom of basin to invert e No trash or debris in the catch basin. lowest pipe into or out of the basin. Dead animals or vegetation that could No dead animals or vegetation generate odors that could cause complaints present within catch basin. or dangerous gases (e.g., methane). Deposits of garbage exceeding 1 cubic foot No condition present which would in volume. attract or support the breeding of insects or rodents. Damage to frame Comer of frame extends more than % inch Frame is even with curb. and/or top slab past curb face into the street (If applicable). Top slab has holes larger than 2 square inches Top slab is free of holes and cracks. or cracks wider than'/, inch. Frame not sitting flush on top slab, i.e., Frame is sitting flush on top slab. separation of more than % inch of the frame from the top slab. Cracks in walls or Cracks wider than''/z inch and longer than 3 Catch basin is sealed and bottom feet, any evidence of soil particles entering structurally sound. catch basin through cracks, or maintenance person judges that catch basin is unsound. Cracks wider than Y. inch and longer than 1 No cracks more than '1 inch wide at foot at the joint of any inlet/outlet pipe or any evidence of soil particles entering catch basin the joint of inlet/outlet pipe. through cracks. Settlement/ misalignment Catch basin has settled more than 1 inch or has rotated more than 2 inches out of Basin replaced or repaired to design standards. alignment. Damaged pipe joints Cracks wider than %-inch at the joint of the inlet/outlet pipes or any evidence of soil entering the catch basin at the joint of the inlet/outlet pipes. Contaminants and , Any evidence of contaminants or pollution pollution such as oil, gasoline, concrete slurries or paint. Sediment accumulation i Trash and debris Damaged Sediment filling 20% or more of the pipe. Trash and debris accumulated in inlet/outlet pipes (includes floatables and non - Cracks wider than '%-inch at the joint of the No cracks more than %-inch wide at inlet/outlet pipes or any evidence of soil the joint of the inlet/outlet pipe. entering at the joints of the inlet/outlet pipes. No cracks more than'/, -inch wide at the joint of inlet/outlet pipes. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Inlet/outlet pipes clear of sediment. No trash or debris in pipes. 1/9/2009 2009 Surface Water Design Manual — Appendix A A-10 APPENDIX A MAWTV'--kNCE REQUIREMENTS FOR FLOW CONTROL --� EYANCE, AND WQ FACILITIES NO.5 - CATCH BASINS AND MANHOLES Maintenance Defect or Problem Condition When Maintenance is Needed Results Expected When Component Maintenance is Performed Metal Grates Unsafe grate opening Grate with opening wider than 71, inch. Grate opening meets design (Catch Basins) I standards. Trash and debris Trash and debris that is blocking more than 20% Grate free of trash and debris. of grate surface. footnote to guidelines for disposal Damaged or missing Grate missing or broken member(s) of the grate. Grate is in place and meets design Any open structure requires urgent standards. maintenance. Manhole Cover/Lid Cover/lid not in place Cover/lid is missing or only partially in place. Cover/lid protects opening to Any open structure requires urgent structure. maintenance. Locking Mechanism cannot be opened by one Mechanism opens with proper tools. mechanism Not maintenance person with proper tools. Bolts Working cannot be seated. Self-locking cover/lid does not work. Cover/lid difficult One maintenance person cannot remove Cover/lid can be removed and to Remove cover/lid after applying 80 lbs. of lift. reinstalled by one maintenance person. V 2009 Surface Water Design Manual — Appendix A 1/9/2009 A-11 APPENDIX A MAINTENANCE REQUT--MENTS FLOW CONTROL, CONVEYANCE, AN"-`VQ FACILITIES NO. 6 - CONVEYANCE PIPES AND DITCHES Maintenance Defect or Problem Conditions When Maintenance is Needed Component Pipes Sediment & debris accumulation Accumulated sediment or debris that exceeds 20% of the diameter of the pipe. Results Expected When Maintenance is Performed Water flows freely through pipes. Vegetation/roots Vegetation/roots that reduce free movement Water flows freely through pipes. + of water through pipes. + Contaminants and Any evidence of contaminants or pollution Materials removed and disposed of pollution such as oil, gasoline, concrete slurries or according to applicable regulations. paint. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Damage to protective I Protective coating is damaged; rust or Pipe repaired or replaced. coating or corrosion corrosion is weakening the structural integrity of any part of pipe. Damaged Ditches I Trash and debris Sediment accumulation Any dent that decreases the cross section area Pipe repaired or replaced. of pipe by more than 20% or is determined to have weakened structural integrity of the pipe. Trash and debris exceeds 1 cubic foot per 1,000 square feet of ditch and slopes. Accumulated sediment that exceeds 20% of the design depth. Noxious weeds Any noxious or nuisance vegetation which may constitute a hazard to County personnel or the public. Contaminants and Any evidence of contaminants or pollution pollution such as oil, gasoline, concrete slurries or paint. Vegetation Erosion damage to slopes Rock lining out of place or missing (If Applicable) 1 /9/2009 Vegetation that reduces free movement of water through ditches. Any erosion observed on a ditch slope. Trash and debris cleared from ditches. Ditch cleaned/flushed of all sediment and debris so that it matches design. Noxious and nuisance vegetation removed according to applicable regulations. No danger of noxious vegetation where County personnel or the public might normally be. Materials removed and disposed of according to applicable regulations. Source control BMPs implemented if appropriate. No contaminants present other than a surface oil film. Water flows freely through ditches. Slopes are not eroding. One layer or less of rock exists above native Replace rocks to design standards. soil area 5 square feet or more, any exposed native soil. 2009 Surface Water Design Manual — Appendix A A-12 L: -PROJECT MEMO D = TO: Mr. Kevin Peterson, City of Federal Way DATE: August 7, 2015 FROM: Dan Smith, PE PROJECT NO.: 2150237.10 Tacoma - (253) 383-2422 PROJECT NAME: Mirror Lake Elementary School Portable Classroom 2015 R ES U B M I17E D SUBJECT: Drainage Review AUG 2 5 2015 CITY OF FEDERAL WAY This memo summarizes our email correspondence (see attached) on Monday, July 13, 2015. This projecttS proposes to add two portable classrooms, ramps, and sidewalk to the existing Mirror Lake Elementary School. We have reviewed the City of Federal Way Addendum to the King County Surface Water Design Manual (effective February 16, 2010). Sections 1.1.1.A 6-13 and 1.1.1.B 6-7, give direction on redevelopment projects requiring stormwater review. This project is a redevelopment in which the total new impervious surface is less than 5,000 square feet and the valuation of proposed improvements is less than 50 percent of the assessed value of the existing site improvements. The project will have 4,990 square feet of new impervious surface. The assessed value of the property, based on information from the King County Department of Assessments, is $3.4 million. The valuation of the proposed improvements is approximately $300,000, which is much less than 50 percent of $3.4 million. Therefore, the project is not subject to a drainage review. In addition, we were provided formal comments in a letter dated June 18, 2015, from the City summarizing the pre -application meeting. These comments noted that the City would not require formal flow control or water quality facilities for this project. Future portable classrooms or other impervious surfaces added may require that flow control and/or water quality treatment facilities be provided, including the requirements of FWRC 19.30.12, "Nonconforming Water Quality Improvements," which indicate that the entire site must be brought into conformance with water quality standards. We understand that if any more projects are proposed for this site, a more holistic approach will be taken to incorporate all the small projects into a more in-depth stormwater review and Technical Information Report (TIR). Please feel free to contact me at (253) 383-2422 if you have any questions or concerns, or if you feel I have overlooked any items. Enclosure DS/Isk Q:\2015\2150237\WORDPROC\Memos\20150807 Memo (Drainage Review) 2150237 10.docx Page 1 of 1 Dan Smith From: Kevin Peterson <Kevin.Peterson@cityoffederalway.com> Sent: Monday, July 13, 2015 1:19 PM To: Dan Smith Cc: William Fierst; Adam Braun Subject: RE: City of Federal Way Stormwater Requirements Dan, I was unable to attend that meeting myself, however, the Development Services Manager did attend, and the following is his recollection of how that came up (with my edits added in parenthesis): That wasn't our (City's) requirement, but part of the conversation at the end (of the meeting) about both schools (Mirror Lake and Panther Lake Elementary schools) and the modular units and multiple small projects putting sites over the threshold. I told them that not for this project, but if they keep doing these small projects, at some point we are going to have to have a more holistic approach to incorporate all these smaller projects which would require a more in depth look and TIR. If memory serves me correct, they then offered to put together a letter or abbreviated TIR to document the stormwater comments they also have listed on the PDFso files would reflect they had done something for this project when they get to the conversation above. For this project, I would suggest just a short narrative that describes the project, amount of new impervious areas added and/or impervious areas being replaced, how the project does not, under the current manual, trigger any 'formal' drainage review requirements, or flow control or water quality requirements, and what BMP's will be used for storm water runoff for this project. Hope this helps. Kevin Peterson Engineering Plans Reviewer City of Federal Way 33325 8th Ave S Federal Way, WA 98003 (253) 835-2734 From: Dan Smith [mailto:d Mith*AHBL.com] Sent: Friday, July 10, 2015 3:22 PM To: Kevin Peterson Cc: William Fierst; Adam Braun Subject: City of Federal Way Stormwater Requirements Kevin, I'm writing in regards to a project I �'.00n be submitting for your review. The erect involves adding two portables to the Mirror Lake Elementary School. i ne project meets the Redevelopment definition in FWRC 19.30.120, is less than 5,000 sf of impervious and less than 7,000 sf of land disturbing activity. Based on the following flow charts in the City of Federal Way's Addendum to the King County Surface Water Design Manual, I'm seeing that there will be no stormwater review required. FlGLiRr; 1,1-1.A Wafer Oualily Re-Aow Flow Char) or wry aua}ily ileview Ft*,remr d ! 8;, Doe doa d�ou mata dalr.taa ar'r�Uevpapmenl` pr Y65 NO onvst.',. PC-_C-1 �roi-�p'a!ea mvd rtrgrJyJali 0: 6 - 13 1t1r09+e10� iY I • S �. S IB t a i A m Sscnon 1.1 to _x 1r.5 ;-ci&rKU0 pl tti�atlrxrnren7 va, hb nh Y_ w.or. 7*-c NMwt;r<t lu Oxe I 1 12 r U" wA1 toiter"emrcts G",tr3 6�, rrl F[da+dl 14'ey R7� 1�8 lOrae i7+` ryn "!ud In u+d iZefe+psta! EN odder-6— •• PrGkr.ucr-aa5r+al vbr �+ao.dw-�•,rr•ed.rr:+v. area r.rin�+dYr.+tc .- rY.'Gn:=93+.I20 aa+•.gecc 9n cao P.aVvnmcr+: e E "•m t� m'rr vcsrn•I, p:. yrsrr. n the G ry Y Mprrt'rrcrm.+nca mae Plane rood tress wa:a q-•��.r n'•xr�a �^-'r+� an`w+•e+r rodrrek{nrC� and raa r�r+�ela�prer.l an � McaXi Ir. scti�on 12 a d N, wddm&r FIGURE Slormwater Review Flow Chart ar L Slormwaler Review ?$rlaf F K!.cc Ikarrkn7r Rt.Wrom-- mu, Core RdiOrLC rtNvls 1 - 7 $PO4;�nl F m.ilipmonls I • f:} DO-0 prc+;.--a meal delutiLrrl of tiedarelapmtnt prolast'ver xG51vOM'+ Y" No 1tv "0' , 5 - i [trre5r'+iGs a III se+&xyl F-t.t.f3 In smtUQn I of this xld&-d-Jm'+ o'. IFes adlc Yes rsa ti4 9rawmaw Raviow ii0 $t0dh1rgtlel' Ftcqu'fed tVi(fM Seo-Sml*r, 1 1.2 of KCSWOM rcr aprir�lic rcq+l;rnmrrts st•5 IIEl r,6_"-} 1*�ul rt4 See °,BLiriln 1 F.2 aI riG$4vCM to SpCtitlt ragWrart-{'r115 I have some notes (see attached) from a pre -application meeting, of which I didn't attend. The notes state that a "short, abbreviated TIR" will be required. Based on what I'm seeing, I wouldn't think a report would be necessary. It would be helpful if you could provide your thoughts on this. Thanks, Dan Smith PE I Project Engineer AHBL, InC. TACOMA • SEATTLE • SPOKANE • TRICITIES 253.383.2422 TEL 1 253.383.2572 FAX I www.ahbl.com WEB Civil Engineers • Structural Engineers • Landscape Architects • Community Planners • Land Surveyors • Neighbors CONFIDENTIALITY NOTE: The information contained in this email and any files transmitted with it may contain confidential or privileged information intended only for the use of the intended recipient(s). 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